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Full Discussion: Setting Variables WITHIN For Loop in DOS Command Shell
Top Forums Shell Programming and Scripting Setting Variables WITHIN For Loop in DOS Command Shell Post 302498027 by ProGrammar on Friday 18th of February 2011 07:04:37 PM
Old 02-18-2011
I know that, the sample of code I posted was copied from the interactive command-line, hence single-% denoted variables. I've been reading the help file for "for /?" and it's pretty worthless and borderline esoteric!

I'm not certain whether my DEVE is working correctly.

Thanks for your suggestion though.

---------- Post updated at 08:04 PM ---------- Previous update was at 06:53 PM ----------

I'm not sure what worked so differently for me this time, but I was able to successfully execute the code above as intended using the following syntax. This is for your reference.

at the interactive command-line, you'll use single-%-denoted iteration variables, but in a batch script, you'll use double-%-denoted variables for the iteration statements/command sets. I'll demonstrate batch-script form, italicized commentary is FYI, the bold-print characters are the actual script commands.

SETLOCAL ENABLEDELAYEDEXPANSION
this line turns on delayed environment variable expansion, necessary to store and expand variables set within the for loop. Otherwise, variable values are expanded as the command is parsed (before execution)

for /f "usebackq" %%A in (`dir /b C:\directory\`) do (
this first line is using %%A as the iterator variable, storing each line of output from dir /b (the b option is equivalent to ls -1 in UNIX)

set origname=%%A
stores the value of %%A into a variable (origname) that can be manipulated later in the loop iteration

set eighth=!origname:~7,1!
this stores the eighth character of origname variable, the variable must now be expanded using exclamation points for flags instead of percent-symbols. But is still subject to all the rules of regullar command-shell variables, including string manipulation.

if !eighth!==3 (
begin if condition
move /Y C:\directory\!origname! C:\directory\output\!origname:~0,7!5!origname:~8,6!
based on result of if comparison, moves original file to a parsing directory for a program that uses 8th character to process based on a rule set, as you can (or cannot) tell--the original filename is expected to be a 14-character string and we're modifying the 8th character to conform to a ruleset for processing
) else (
move /Y C:\directory\!origname! C:\directory\output\!origname:~0,7!3!origname:~8,6!
)
)

The else condition is a coverall for files that do conform to a ruleset but erred for one reason or another and thus processes them using a different ruleset.

Hopefully this makes sense to you. Initially, when the command-line was expanding the variables, it was printing some funky stuff. It seemed to just start working, but who knows--I've been staring at this damm screen so long.

ProGrammar
 

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LEARN ABOUT NETBSD

cd

CD(1)							    BSD General Commands Manual 						     CD(1)

NAME

     cd -- change working directory

SYNOPSIS

     cd directory

DESCRIPTION

     Directory is an absolute or relative pathname which becomes the new working directory.  The interpretation of a relative pathname by cd
     depends on the CDPATH environment variable (see below).

ENVIRONMENT

     The following environment variables affect the execution of cd:

     CDPATH  If the directory operand does not begin with a slash (/) character, and the first component is not dot (.) or dot-dot (..), cd
	     searches for the directory relative to each directory named in the CDPATH variable, in the order listed.  The new working directory
	     is set to the first matching directory found.  An empty string in place of a directory pathname represents the current directory.	If
	     the new working directory was derived from CDPATH, it will be printed to the standard output.

     HOME    If cd is invoked without arguments and the HOME environment variable exists and contains a directory name, that directory becomes the
	     new working directory.

     See csh(1) for more information on environment variables.

     The cd utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     csh(1), pwd(1), sh(1), chdir(2)

STANDARDS

     The cd command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

BSD
								   June 5, 1993 							       BSD
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